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Finding the Fourth Proportional to 1,229.43, 1,842.94 and 789.45

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Solution

The fourth proportional to 1,229.43, 1,842.94 and 789.45 is: 1,183.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.43 : 1,842.94 = 789.45 : x
  2. Step 2: Convert to fraction form
    1,229.43/1,842.94 = 789.45/x
  3. Step 3: Cross multiply
    1,229.43x = 1,842.94 × 789.45
  4. Step 4: Simplify right side
    1,229.43x = 1,454,908.98
  5. Step 5: Solve for x
    x = 1,454,908.98/1,229.43
  6. Step 6: Final answer
    x = 1,183.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.